Shop Pressure Pump Parts at West Marine
Diaphragm freshwater pumps are widely used aboard boats to supply pressurized water to sinks, showers, and toilets. These pumps use a flexible diaphragm to generate pressure, delivering steady water flow throughout the system. While diaphragm pumps are durable, regular use can wear down key components over time. West Marine carries a full range of replacement parts to restore performance and extend the life of your freshwater pump.
Common Replacement Parts for Diaphragm Pumps
Diaphragms: These flexible membranes handle the core pumping action. Over time, diaphragms may crack or stiffen, reducing performance or causing leaks. Replacing them restores the pump’s ability to build and maintain pressure.
Valves: Check valves on the pump’s inlet and outlet sides control flow direction and help maintain pressure. If damaged or clogged, they can cause inconsistent output or backflow issues.
Pressure Switches: These switches start and stop the pump in response to system pressure. A failed switch can result in a pump that won’t shut off or won’t turn on. Replacement switches are available for most pump models.
Motors: Though designed to last, pump motors can fail due to overheating, moisture, or electrical issues. If your motor is running intermittently—or not at all—a replacement motor may be required.
Strainers: Found on the inlet side of most pumps, strainers protect the internal components by filtering out debris. Cleaning or replacing them helps maintain optimal performance and reduces wear on the system.
West Marine stocks pressure pump parts from trusted brands like Jabsco, Shurflo, Flojet, and Johnson Pump. With regular inspection and maintenance, you can keep your onboard freshwater system running smoothly season after season.
Pressure Pump Parts FAQ
Diaphragms, check valves, pressure switches, pump strainers, and occasionally motors are the most frequently replaced components. These parts wear out over time due to normal use and water quality.
Symptoms include reduced flow rate, inconsistent pressure, or water leaking from the pump housing. If the diaphragm is cracked, stiff, or torn, it should be replaced to restore proper function.
The pressure switch automatically turns the pump on when system pressure drops and off when it reaches the set point. If the switch fails, the pump may run continuously or fail to activate at all.
Turn off the pump, remove the strainer bowl, and rinse out any debris. If the mesh or housing is damaged or brittle, it’s time to replace it. Keeping the strainer clean protects your entire pump system.
Motor failure can result from overheating, water intrusion, electrical shorts, or excessive load. If the pump won’t run or cuts out intermittently, inspect the motor and consider replacing it if repairs aren't feasible.
At least once per season, or more often if you live aboard or use the boat frequently. Check for leaks, reduced flow, and unusual pump cycling behavior. Preventive maintenance reduces the chance of system failure.
Most replacement parts are brand- and model-specific. Always check your pump’s part number and specifications to ensure compatibility with replacement diaphragms, valves, or motors.
Yes. With basic tools and a service manual, many boaters can replace diaphragms, valves, or switches on their own. Always turn off power and relieve pressure in the system before performing any repairs.
This is called short cycling. It could be caused by a clogged strainer, faulty pressure switch, or failing check valve. Inspect these components and replace any that show signs of wear or damage.
We carry original replacement parts for Jabsco, Shurflo, Flojet, and Johnson Pump. These include complete rebuild kits, motor replacements, switches, strainers, and more.
